Tutorial by Examples: et

Multiple return

Function xyz returns two values a and b: def xyz(): return a, b Code calling xyz stores result into one variable assuming xyz returns only one value: t = xyz() Value of t is actually a tuple (a, b) so any action on t assuming it is not a tuple may fail deep in the code with a an unexpecte...

Python Language • Common Pitfalls

Difference between %TYPE and %ROWTYPE.

%TYPE: Used to declare a field with the same type as that of a specified table's column. DECLARE vEmployeeName Employee.Name%TYPE; BEGIN SELECT Name INTO vEmployeeName FROM Employee WHERE RowNum = 1; DBMS_OUTPUT.PUT_LINE(vEmp...

plsql • Getting started with plsql

@Valid usage to validate nested POJOs

Suppose we have a POJO class User we need to validate. public class User { @NotEmpty @Size(min=5) @Email private String email; } and a controller method to validate the user instance public String registerUser(@Valid User user, BindingResult result); Let's extend the U...

spring • Spring JSR 303 Bean Validation

Getting list of all related children objects in parent's serializer

Assume that, we implement a simple API and we have the following models. class Parent(models.Model): name = models.CharField(max_length=50) class Child(models.Model): parent = models.ForeignKey(Parent) child_name = models.CharField(max_length=80) And we want to return a respo...

django-rest-framework • Serializers

Valet domain

This command allows you to change or view the TLD (top-level domain) used to bind domains to your local machine. Get The Current TLD $ valet domain > dev Set the TLD $ valet domain local > Your Valet domain has been updated to [local].

Laravel • Valet

Installation or Setup

Detailed instructions on getting avr set up or installed.

avr • Getting started with avr

SendMessage method

https://api.telegram.org/bot*BOTTOKEN*/sendmessage?chat_id=exampleID&text=exampleText&parse_mode=HTML What does this do? With your parameters adjusted correctly this call will send a message to the exampleID user with the exampleText as message with an HTML encoding. Standard encoding is ma...

telegram-bot • Basic methods and how to use them

Installation or Setup

Detailed instructions on getting greasemonkey set up or installed.

greasemonkey • Getting started with greasemonkey

Comparison between Promises and Async/Await

Function using promises: function myAsyncFunction() { return aFunctionThatReturnsAPromise() // doSomething is a sync function .then(result => doSomething(result)) .catch(handleError); } So here is when Async/Await enter in action in order to get clean...

Node.js • Async/Await

Setting up IntelliJ Idea for Selenium

Prerequisites: Java is installed Selenium is extracted in a folder (Contains 2 files, and 1 folder) Follow these steps to set up IntelliJ Idea for Selenium. Click On "New Project". Choose Java < "Hello World" Application Type the name of the Project, and create it....

selenium • First project in selenium with Java

Setting up ChromeDriver

Prerequisites : ChromeDriver is downloaded Copy the following code into your class. public static void main(String[] args) { System.setProperty("webdriver.chrome.driver", "path of the exe file\\chromedriver.exe"); } If you're using linux, give the path to the ChromeDri...

selenium • First project in selenium with Java

Getting Elements in Selenium

Every Html-Element in Selenium is called a WebElement. For example, a p tag would be a WebElement, an a tag would be a WebElement, etc. Consider the following html Structure: <a id="link1" href="https://www.google.com">google</a> <p class="p1"> This...

selenium • First project in selenium with Java

Getting Attributes of WebElements in Selenium

To get the attribute of a WebElement, we use getAttribute on that WebElement. For example, consider the following html tag <a id="click" href="https://www.google.com"> We can find the Element's href attribute by WebElement e = driver.findElement(By.id("click&quot...

selenium • First project in selenium with Java

Installation or Setup

Detailed instructions on getting openui5 set up or installed.

openui5 • Getting started with openui5

A simple test written with xUnit.net

using Xunit; namespace MyFirstUnitTests { public class TestClass { [Fact] public void PassingTest() { Assert.Equal(4, Add(2, 2)); } [Fact] public void FailingTest() { Assert.Equal(5, Add(2, 2)); ...

xunit • Getting started with xunit

Getting started

A-Frame can be developed from a plain HTML file without having to install anything! A great way to try out A-Frame to remix the starter example on Glitch, an online code editor that instantly hosts and deploys for free. Or create an .html file and include A-Frame in the head: <html> <he...

aframe • Getting started with aframe

Installation or Setup

Detailed instructions on getting angularjs-ng-repeat set up or installed.

angularjs-ng-repeat • Getting started with angularjs-ng-repeat

Installation and Setup

The installation is quite simple as there are seperate installers for MacOS and Windows machines available here. Currently two versions are for download: one beta and one stable. Setup will start after you downloaded the program and you´ll need to login with your GitHub credentials. That is really ...

github • GitHub Desktop

Use a "Font Awesome Icon" for the DatePicker (xe:djDateTextBox)

The default icon of the Date-Picker in the Extension Library from OpenNTF is nice but not sexy. You can change it to one of the cool "Font Awesome Icons". First, add a DatePicker component to your page: <xe:djDateTextBox id="datePickerComp" value="#{myDoc.myDateField}&q...

xpages • Usage of "Extension Library"

Jinja2 installation and setup

Install the dependencies: pip install jinja2 Install a framework: pip install flask Create the following structure ├── run.py └── templates Put a file template.html in the templates directory. The file can contain a jinja 2 variable named my_string. <!DOCTYPE html> <html lang=&qu...

jinja2 • Getting started with jinja2